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k in (-oo:+oo)
-35 = -7*k-(6*k)-9 // + -7*k-(6*k)-9
6*k-(-7*k)-35+9 = 0
7*k+6*k-35+9 = 0
13*k-26 = 0 // + 26
13*k = 26 // : 13
k = 26/13
k = 2
k = 2
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